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With the main aim of providing design guidance, fatigue endurance tests were performed on six weld details in type 304L austenitic and S31803 duplex stainless steel plate or tube. Most details were tested at R = 0.1 and 0.5 for comparison. Limited tests on one detail were also performed under variable amplitude loading at R ~ 0. Furthermore, partly to complement the endurance tests but also to study in detail the fatigue process in duplex HAZ, fatigue crack growth and threshold tests were performed on the parent steel plates, corresponding weld metals and simulated HAZs. Tests were performed in air and in 3% NaCl solution to investigate corrosion fatigue, usually at both R = 0.05 and 0.5. Detailed metallurgical and fractographic examinations were performed to investigate the extent to which microstructure influenced fatigue crack growth. In addition, some fracture mechanics modelling of the fatigue behaviour of selected weld details, including the determination of the stress intensity factor solution for the case of weld throat cracking in the cruciform joints tested, was performed.

Overall, it was found that the current design S-N curves in the IIW fatigue design recommendations for C-Mn steels were suitable for the weld details tested in stainless steel plate. An exception was the cruciform joint failing in the weld throat, where the Eurocode 3 curve was more appropriate for both C-Mn and stainless steels. The present results for tubular joints were also found to be consistent with data for similar details in C-Mn steels, and with the recent CIDECT design curve..

Additional information

Authors: SONSINO C M, Fraunhofer Institut fur Betriebsfestigkeit LBF, Darmstad (DE);MADDOX S J, TWI Ltd, Great Abington, Cambridge (UK);NOURA BRANCO C, Instituto Superior Technico, Lisbon (PT)
Bibliographic Reference: EUR 19972 EN (2001), pp. 194. Euro: 29.50
Availability: Available from EUR-OP sales agent URL:
ISBN: ISBN 92-894-1569-X
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